2010 Ninja 250 Jetting Questions

abhijitz · November 14th, 2011, 07:59 PM

so, am prepping my bike for race next year and along with some other mods, i got to do the jetting. Unfortunately, some of the DIY's there are no pics and i also read the reason why the pics were removed

So, here is my understanding, please correct me

1. I can buy the Dynojet kit, comes with ranges of jets and i just test what i like

2. Shimming the needles - this is not needed since Dynojet kit comes with adjustable needle?

3. Drilling out cap from fuel/air mixture screw. Only needed for fine tuning

Am i missing anything else? Also, i do not see any DIY on the Dynojet Kit install. IF someone can point me to the right thread, i would highly appreciate it.

choneofakind · November 14th, 2011, 08:30 PM

I would use Factory Pro just because it comes with a larger selection of jets to choose from. Shimming is not necessary. That's what the needles in the jet kit take care of. The idle mix screws are for getting the mixture at idle right.

to install the jet kit, just follow the instructions for shimming, only put your jet kit needles in, instead of shimming the oem needles.

here's a good base set of guidelines to install a jet kit and tune carbs:
http://www.factorypro.com/tech_tunin...m_engines.html

abhijitz · November 14th, 2011, 08:33 PM

Thank You.

Problem with Factory Pro is i need to piece everything individually (jet sizes). whereas with dynojet i get a full variation/kit of jets. Isnt that true?

I am still trying to search user posts who have succesfully installed some kits and have published their numbers.

choneofakind · November 14th, 2011, 08:40 PM

not true. Everything comes in one kit for you. The only difference between the configuration 1 and the configuration 3 kits is the range of jets that come in the kit

http://www.factorypro.com/prod_pages/prodk04.html

process is the same with a pre-gen and ne-gen.

http://faq.ninja250.org/wiki/How_do_...l_a_jet_kit%3F

if you folllow the shimming DIY it will get you most of the way there. then check out the DIY on changing jets without removing the airbox. And and DIY carb cleaning for more pictures of the carbs opened up. Jetting really isn't too bad.

abhijitz · November 14th, 2011, 08:43 PM

Thanks again :thumbup ... I had a wrong perception then.

Let me read up and i am pretty sure i will have more questions

abhijitz · November 15th, 2011, 09:39 AM

Ok Chris - read the threads. seems really simple to do. Just need to take my time i guess.....

So, my Ninja 250 is going to be a track/race bike 90% of the time. I might seldom ride the street if i have time to put back the street plastics on.

So, as recommended in the FAQ, should i stick with the Dynojet Kit? Is there a significant throttle response difference between the Dynojet Kit and FactoryPro. The less drilling around i need to do, better for me

choneofakind · November 15th, 2011, 11:12 AM

Well you can install either kit and decide to drill or not to drill with either kit. Personally I would buy the FactoryPro kit because the Dynojet kit doesn't have as many jet sizes in its' range of jets, and I've read of people buying DJ jets after already buying a DJ jet kit. Plus the FP kits come with hex screws for the bowls as well. It's up to you

And yes, jetting isn't bad, just takes some patience and know how.

abhijitz · November 19th, 2011, 09:09 PM

Well, i just complete reading the Jetting database and some other threads. Note : My bike will be used mostly as a racebike and i need the top end to be crisp and responsive. Looks like Dynojet Stage 2 will be more suitable?

However Stage 2, doesnt talk about drilling the slide BUT Stage 3 does. Stage 3 is not for 08+ as outlined on Dynojet site.

Anyone with a race setup want to comment ?

abhijitz · November 21st, 2011, 02:01 PM

Ok - confirmed with AFM that snorkel box need to be ON.

Also, wrt to Drilling the slide, it is more of a fine tuning process to drill the slide with either the Jet Kits.

so, finally the question remains, with snorkel box ON ... is it even worth buying the jet kit .. OR just shim the needles with washers. When i spoke to Dynojet and explained them the scenario, they said just use stock OR use their #94 mainjet.

racegunnr · November 21st, 2011, 02:26 PM

Quote:

Originally Posted by abhijitz

Ok - confirmed with AFM that snorkel box need to be ON.

Also, wrt to Drilling the slide, it is more of a fine tuning process to drill the slide with either the Jet Kits.

so, finally the question remains, with snorkel box ON ... is it even worth buying the jet kit .. OR just shim the needles with washers. When i spoke to Dynojet and explained them the scenario, they said just use stock OR use their #94 mainjet.

i think you will still want to jet just to get better response of the throttle especially when rolling of or on in the corners.......factory leaves a little to be desired.....JMO

abhijitz · November 22nd, 2011, 12:59 PM

yep and the needle as well...

Well, after talking around and also understanding Dynojet doesnt recommend drilling the slides either for 08+ (and of course it is a personal choice per the other DIY thread), am planning to go with the FactoryPro on the reason that they provide more jets than the Dynojet (plus they have a pilot jet #40 in their kit, though i shouldnt be needing it).

It might take some time for me to piece out everything. I will post HOW-TO pics and dyno results. Stay tuned

November 14th, 2011, 07:59 PM	#1
abhijitz ninjette.org sage Name: Abhijit Location: San Francisco Join Date: Nov 2011 Motorcycle(s): Many Two Wheels .. Posts: 611	2010 Ninja 250 Jetting Questions so, am prepping my bike for race next year and along with some other mods, i got to do the jetting. Unfortunately, some of the DIY's there are no pics and i also read the reason why the pics were removed So, here is my understanding, please correct me 1. I can buy the Dynojet kit, comes with ranges of jets and i just test what i like 2. Shimming the needles - this is not needed since Dynojet kit comes with adjustable needle? 3. Drilling out cap from fuel/air mixture screw. Only needed for fine tuning Am i missing anything else? Also, i do not see any DIY on the Dynojet Kit install. IF someone can point me to the right thread, i would highly appreciate it.

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November 14th, 2011, 08:30 PM	#2
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	I would use Factory Pro just because it comes with a larger selection of jets to choose from. Shimming is not necessary. That's what the needles in the jet kit take care of. The idle mix screws are for getting the mixture at idle right. to install the jet kit, just follow the instructions for shimming, only put your jet kit needles in, instead of shimming the oem needles. here's a good base set of guidelines to install a jet kit and tune carbs: http://www.factorypro.com/tech_tunin...m_engines.html

November 14th, 2011, 08:33 PM	#3
abhijitz ninjette.org sage Name: Abhijit Location: San Francisco Join Date: Nov 2011 Motorcycle(s): Many Two Wheels .. Posts: 611	Thank You. Problem with Factory Pro is i need to piece everything individually (jet sizes). whereas with dynojet i get a full variation/kit of jets. Isnt that true? I am still trying to search user posts who have succesfully installed some kits and have published their numbers.

November 14th, 2011, 08:40 PM	#4
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	not true. Everything comes in one kit for you. The only difference between the configuration 1 and the configuration 3 kits is the range of jets that come in the kit http://www.factorypro.com/prod_pages/prodk04.html process is the same with a pre-gen and ne-gen. http://faq.ninja250.org/wiki/How_do_...l_a_jet_kit%3F if you folllow the shimming DIY it will get you most of the way there. then check out the DIY on changing jets without removing the airbox. And and DIY carb cleaning for more pictures of the carbs opened up. Jetting really isn't too bad.

November 14th, 2011, 08:43 PM	#5
abhijitz ninjette.org sage Name: Abhijit Location: San Francisco Join Date: Nov 2011 Motorcycle(s): Many Two Wheels .. Posts: 611	Thanks again :thumbup ... I had a wrong perception then. Let me read up and i am pretty sure i will have more questions

November 15th, 2011, 09:39 AM	#6
abhijitz ninjette.org sage Name: Abhijit Location: San Francisco Join Date: Nov 2011 Motorcycle(s): Many Two Wheels .. Posts: 611	Ok Chris - read the threads. seems really simple to do. Just need to take my time i guess..... So, my Ninja 250 is going to be a track/race bike 90% of the time. I might seldom ride the street if i have time to put back the street plastics on. So, as recommended in the FAQ, should i stick with the Dynojet Kit? Is there a significant throttle response difference between the Dynojet Kit and FactoryPro. The less drilling around i need to do, better for me

November 15th, 2011, 11:12 AM	#7
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	Well you can install either kit and decide to drill or not to drill with either kit. Personally I would buy the FactoryPro kit because the Dynojet kit doesn't have as many jet sizes in its' range of jets, and I've read of people buying DJ jets after already buying a DJ jet kit. Plus the FP kits come with hex screws for the bowls as well. It's up to you And yes, jetting isn't bad, just takes some patience and know how.

November 19th, 2011, 09:09 PM	#8
abhijitz ninjette.org sage Name: Abhijit Location: San Francisco Join Date: Nov 2011 Motorcycle(s): Many Two Wheels .. Posts: 611	Well, i just complete reading the Jetting database and some other threads. Note : My bike will be used mostly as a racebike and i need the top end to be crisp and responsive. Looks like Dynojet Stage 2 will be more suitable? However Stage 2, doesnt talk about drilling the slide BUT Stage 3 does. Stage 3 is not for 08+ as outlined on Dynojet site. Anyone with a race setup want to comment ?

November 21st, 2011, 02:01 PM	#9
abhijitz ninjette.org sage Name: Abhijit Location: San Francisco Join Date: Nov 2011 Motorcycle(s): Many Two Wheels .. Posts: 611	Ok - confirmed with AFM that snorkel box need to be ON. Also, wrt to Drilling the slide, it is more of a fine tuning process to drill the slide with either the Jet Kits. so, finally the question remains, with snorkel box ON ... is it even worth buying the jet kit .. OR just shim the needles with washers. When i spoke to Dynojet and explained them the scenario, they said just use stock OR use their #94 mainjet.

November 22nd, 2011, 12:59 PM	#11
abhijitz ninjette.org sage Name: Abhijit Location: San Francisco Join Date: Nov 2011 Motorcycle(s): Many Two Wheels .. Posts: 611	yep and the needle as well... Well, after talking around and also understanding Dynojet doesnt recommend drilling the slides either for 08+ (and of course it is a personal choice per the other DIY thread), am planning to go with the FactoryPro on the reason that they provide more jets than the Dynojet (plus they have a pilot jet #40 in their kit, though i shouldnt be needing it). It might take some time for me to piece out everything. I will post HOW-TO pics and dyno results. Stay tuned